Hi!,
Yes!. Audiofusion is a great solution to use with the Mackie DL32. Simply connect the USB (Computer) out to a Mac. SoundCaster will automatically recognize all 32 channels available from the mixer. Pick any 16 of the 32 to include in the mix and SoundCaster will broadcast them over Wi-Fi to the Performer app each musician uses on their phone to both hear and control their own mix. Right now the Performer app is only available for iOS devices but we hope to have an android version out in the next 3 or 4 months. In the meantime, if you are looking for a permanent solution you could pick up a used iPhone 6 for under $200 these days. You only need the Wi-Fi function so the phone would not even need a cell phone plan.
Send me an email at leafblad@audiofusionsystems.com if you would like to try our beta version.
Thanks,
Brandon

Hi Theo,
If you check out posts from Christian Luper in the audiofusion beta testers group on facebook; he has tested some third party software such as loopback to get SoundCaster to recognize another DAW as an audio input device. We have not done enough testing on these other software to have any recommendations.
Maybe just post a question on the facebook group and see what kind of ideas they suggest.

Hi Phil,
When available for Android you will be able to mix devices. It will all be plug n play so any device running Performer will be able to connect to SoundCaster.
I've not tried it with GarageBand but we run it on the same computer as Ableton all the time. Our software operates much like a DAW in how it gets the audio so both programs cannot choose that same audio input device at the same time. So we have to run a separate audio interface for Ableton going out and connect SoundCaster to the mixer coming in. Some testers have been successful using Loopback or other 3rd party software to get SoundCaster to recognize the output from another DAW as an audio source so you could experiment with that.